Attachment-plug cap



July 29, 1930. H. HUBBELL. JR

' ATTACHMENT PLUG CAP Filed May 5, 1928 Patented July 29, 1930 UNITED STATES HARVEY HUBBELL, JR, BRIDGEPORT, GONNFGIIGUT ATTACHMENT-PLUG GAP Application filed Kay 3, 1928. Serial No. 274,888.

- This invention relates to attachment plug ca'ps such as are used on flexible lead wires from portable electrical devices and adapted to be lnserted into outlet receptacles for supplying power to these devices from the house wirin system.

It as for an object to simplify the construction and assembly of these devices and to provide a more rigid and reliable mounting for the contacts in the insulating body of the cap.

With the foregoing and other objects in view, the invention consists in certain novel features of construction, combinations and w arrangements of parts as will be more fully described, a construction illustrating one form of my invention being shown in the accompanying drawin In this drawing,

Fig. 1 is a section t rough an attachment plug cap showing my invention applied thereto, the section beingsubstantially on line 1--1 of Fig. 2 except that the contact blades are shown in elevation.

Fig. 2 is an end elevation of the device looking from the bottom of Fig. 1.

Fig. 3 is a detail section showing the means of securing the binding post plate to the contact blades.

Fig. 4 is a bottom planview thereof look toward the bottom of Fig. 3. ig. 5 is a detail section substantially on line'5-5 of Fig. 4.

Fig. 6 is a side elevation of the contact blades.

Fig. 7 is an edge view thereof.

Fig. 8 is an end view thereof looking toward the bottom of Fig. 6.

Fig. 9 is aplan view of the b inding post plate, and

/ curatel of this material on the Fig. 10 is a transverse section thereof sub:

cure the plate to the body. In this arrangement the eyelets or inserts must be very acpositioned and the operations of assemb ing the plates on these eyelets and spinning over the eyelets are relatively expensive.

In my resent construction I do away with these eye ets and the spinning over operation and mold the contact blades directl in the insulating body. The binding post p ates are then mounted on these blades so that the blades are not only rigidly and securely mounted in the body, but they also serve as the means for securing the binding post plates to the body. 65 In the drawing numeral 11 represents the usual type of insulating body for these caps.

It is recessed, as shown at 12, at its inner or lower side for the contact elements and has a longitudinal opening 13 for the lead wires, not shown, from a portable electrical device. The blade contacts 14 are of the usual shape, substantially rectangular in cross section, and are arranged in the usual parallel relation on opposite sides of the. opening 13. In the pres-. ent construction, however, they are offset, as shown at 15, to provide a shoulder and also to position the inner end portion 16 laterally outward from the projecting portion 14. These inner end ortions 16 are molded directly in the insu ating material of the body 11, and may-be provided with suitable means to increase the gripping or holding efi'ect b ades such as transverse openings 17 into which some of the insulating material will flow or be forced during the molding operation. It is'preferred that these blades bemolded in the material with the shoulder or offset portion 15 seated in a transverse recess in the wall at the bottom of the recess 12.

Binding post'plates 18 are stamped from sheet metal as separate elements and carry the usual tape of means for securin the lead wires to t ese plates, suchas bin 'n post screws 19, threaded into the plates. 1 ese plates also each. have a rectangular opening 20 for one of the blade contacts 14. This opening is conveniently formed by cutting the plate with a three sided cut, as shown in Fig. 9. The metalbetween the cuts is forced laterally to form. a lug 21 integral with the plate. A portion of t e free endof this lug s removed at the same time so as to shorten 5 it somewhat. In assembling the blade contact 14, which has "already been molded in position in the insulating body 11, is inserted through the o eriing20 permitting thepl'ate 8 to rest on t e wall or shoulder at theghot- 10 tom of the recess 12. The elements .jare now in the position of Figs. 3 and 4. 7 Then the free end of the lug 21'is forced inwardly to substantiall the plane of the plate 18, and .the lug is 0 such a len h that when thisoperation is performedt e contact blade 14 is firmly clamped between the free end of the lug 21 and the opposite side edge of the opening 20. The elements are now in the position of Figs. 1 and 2, and the plate 18 is 20 firmly secured to the blade 14 and is, therefore, firmly mounted by this blade in position inthe body of the cap. a This makes a very rigid, simple construction, and. one which may be easily and quickly assembled. 5 The body 11 is molded with a pocket or recess 22 to receive the inner end of the binding screw.

Having thus set forth the nature of my invention, what I claim is: I

1. In an attachment plug cap, an insulatingbody member, a contact blade mounted on the body with one end molded therein, a bindin post plate having an opening theretnroug for said blade and a lug at one side or said opening pressed against the blade to secure the plate to the blade and means for connecting a lead wire to said plate.

2. In an attachment plug cap, an insulating body member, a blade contact offset laterally 4 intermediate the ends thereof, said contact having one end thereof molded in the body with one side of said ofi'set resting against the body, a binding post plate secured to the contact against the other side of the oflset,

and means for securing a lead wire. to said plate.

3. In an attachment plug cap, an insulating body member, a contact blade having a .lateral shoulder intermediate its ends and mounted on the body with one end molded therein, a plate having an opening therethrou h for said blade and a lug at one side of sai opening pressed against the blade to secure the'plate to the blade, and means for connecting a lead wire to said plate.

4. In an attachment plug cap, an insulating bodymember, 'a'blade contact molded at 'one end in said bofdy,:a plate having an opening therethrough to receive the contact and a 1 at-"o'nexside of said'openin forced into su 'st'antially' the plane of the p ate to clamp the blade in the opening, and means for securing a lead wire to said plate.

In testimony whereof-I aflix 1n signature.

HARVEY HUB ELL, J R. 

